Lowering nighttime temps

Temp is directly linked to how much moisture the air can hold. Lowering temp without raising rh you will need to setup a negative pressure within the tent extracting to a desired rh. Air going in will need to be cooled to consistent level or have a ambient direct line to the cold temps and outside air. Plants need fresh supply of oxygen at night and co2 during daylight if your not measuring or have a replenishing source both can quickly be gobbled up in a "sealed room" If you breach the compensation point of co2, growth will be effected dramatically. Have rh set to extraction thresholds. Ambient line to outside with 3,4,5,6 180 bends depe dong on needs, each bend will double the amount of force required to make air go around that corner. Basics. When a tent extractor comes on to set the rh to 50, then 80%90 of the air drawn into the tent comes from lower intake of whatever room the tent sits in, while the open air ambient line brings in 5, 10, 15% depending on # of bends ,fresh air packed with oxygen and co2 as a bonus. Careful placement of ducting inside the tent will prevent heat escaping or humidity. Only other thing you can do is use a portable ac. Good luck.

Entweder mit einem Ventilator. Der senkt die Temperatur ohne Luftfeuchtigkeit zu erhöhen. Eine andere Möglichkeit ist eine kleine Klimaanlage die senkt auch die Temperatur aber senkt auch die Luftfeuchtigkeit sonst gibt es nicht so viel mehr was mir einfällt

It's in the name - Relative Humidity. Absolute humidity is mass of water per volume of atmosphere. It remains the same as temperature drops, but humidity increases, because it more easily condenses in cooler temps. So, The only way to avoid an RH spike when temperatures drop is to run a dehumidifier, which will reduce absolute humidity, and also provide some heat, good or bad. As long as it's not 65% you should not be in danger of elevated microbial growth. Also, once lights shut off, plants release significantly less moisture, which would help if the room is not sealed. Are you providing co2? otherwise, may want to rethink a 'sealed' room. Gas exchange is important and humidity might dissipate after lights out. Can do this without letting light in.